[MacPorts] #59522: [icu-le-hb] : missing link with ICU libraries

[MacPorts]

#59522: [icu-le-hb] : missing link with ICU libraries
----------------------+-----------------------
 Reporter:  RJVB      |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:  haspatch  |       Port:  icu-le-hb
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 For some curious reason the icu-le-hb buildsystem fails to link the
 library with the ICU libraries. This can go undetected as long as those
 dependencies are loaded first in applications that depend on libicu-le-hb
 (and thus also as long as you do not load the library in isolation in a
 thin wrapper around the `dlopen()` call).

 Apparently that order did change for me, which led to an error from the
 dynamic linker/loader (dyld.so) about an `undefined symbol:
 _ZTIN6icu_657UObjectE` (the loader bails at the 1st error so we cannot
 know how many other symbols are undefined too).

 The attached patch adds the `ICU_LIBS` libraries obtained from pkg-config
 to the libicu-le-hb link dependencies, which fixes the issue for me (and
 should be a transparent change otherwise).

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Ticket URL: <https://trac.macports.org/ticket/59522>
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